US3336445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holding system for general automatic telephone circuit
Assignee: NEC Corp
•
Filing: 1964-06-24
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Granted: 1967-08-15
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Nakagawa Takeshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/327; H04N1/32795
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A TELEPHONE CIRCUIT HOLDING SYSTEM FOR MAINTAINING CIRCUIT CONTINUITY BETWEEN THE TRANSMITTER-SUBSCRIBER AND UNATTENDED RECEIVER-SUBSCRIBER OF INFORMATION TRANSFER EQUIPMENT, UNDER CONTROL OF THE TRANSMITTER, COMPRISING: RECEIVER MEANS RESPONSIVE TO A CALL SIGNAL FOR INITIALLY CLOSING THE ASSOCIATED SUBSCRIBER LOOP AND ISSUING A CONNECTION-COMPLETION SIGNAL; MEANS AT THE TRANSMITTER FOR INITIATING A CONNECTIONHOLD SIGNAL UPON RECEIVING THE CONNECTION-COMPLETION SIGNAL; RECEIVER MEANS RESPONSIVE TO SAID CONNECTION-HOLD SIGNAL FOR SECURING THE ASSOCIATED SUBSCRIBER LOOP AND CUTTING-OFF SAID CONNECTION-COMPLETION SIGNAL; MEANS AT THE TRANSMITTER FOR INITIATING THE INFORMATION TRANSFER;
Claim 2
Dependent Claim
85 words
A TELEPHONE CIRCUIT HOLDING SYSTEM FOR MAINTAINING CIRCUIT CONTINUITY BETWEEN THE TRANSMITTER-SUBSCRIBER AND UNATTENDED RECEIVER-SUBSCRIBER OF INFORMATION TRANSFER EQUIPMENT, UNDER CONTROL OF THE TRANSMITTER, COMPRISING: RECEIVER MEANS RESPONSIVE TO A CALL SIGNAL FOR INITIALLY CLOSING THE ASSOCIATED SUBSCRIBER LOOP AND ISSUING A CONNECTION-COMPLETION SIGNAL; MEANS AT THE TRANSMITTER FOR INITIATING A CONNECTIONHOLD SIGNAL UPON RECEIVING THE CONNECTION-COMPLETION SIGNAL; RECEIVER MEANS RESPONSIVE TO SAID CONNECTION-HOLD SIGNAL FOR SECURING THE ASSOCIATED SUBSCRIBER LOOP AND CUTTING-OFF SAID CONNECTION-COMPLETION SIGNAL; MEANS AT THE TRANSMITTER FOR INITIATING THE INFORMATION TRANSFER;
References Cited (Backward Citations)
US1880311A
Cited
US2691063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |